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Ammonium sulfide, also known as diammonium sulfide, is an unstable salt with the formula (NH₄)₂S. Aqueous solutions purporting to contain this salt are commercially available. With a pKₐ exceeding 15, the hydrosulfide ion cannot be deprotonated to an appreciable amount by ammonia. Thus, such solutions mainly consist of a mixture of ammonia and SH. Ammonium sulfide solutions are used occasionally in photographic developing, to apply patina to bronze, and in textile manufacturing. Also, due to its offensive smell, it is the active ingredient in a variety of foul pranks including the common stink bomb.
A method for recovering manganese from electric furnace ferromanganese slag
This invention discloses a method for recovering manganese from electric furnace ferromanganese slag, comprising the following steps: crushing and uniformly mixing the ferromanganese slag, then drying it; uniformly mixing the dried ferromanganese slag with flux, calcining it in a tube furnace until the reaction is complete, and after the temperature drops to room temperature, removing the calcined slag sample, adding deionized water to leach manganese sulfate at room temperature, filtering and separating to obtain crude manganese sulfate solution and leaching residue; adding metallic manganese powder, ammonium sulfide, and flocculant to the crude manganese sulfate solution to further remove impurities, then adjusting the pH, filtering and separating to obtain a four-stage purified manganese sulfate solution. This invention utilizes a mixed flux to sulfatate metal oxides, achieving higher sulfatation efficiency than existing technologies, accelerating the process of extracting manganese from ferromanganese slag to produce high-purity manganese tetroxide, while simultaneously solving the resource waste and environmental pollution problems caused by ferromanganese slag from electric furnaces.
Owner:CHONGQING YUEJIA NEW MATERIALS CO LTD +2